Mechanical movement



Sept. 2, 1930. J. c. CALL l 1,774,501`

` MECHANICAL MOVEMENT l Filed Nov. 12, 1928 Patented Sept. 2, 1939UNITED STATES JOSEPH C. CALL, OF BLNCROFQ, IDAHO MIE HAEICL IVOVEIYIENTApplication. le November 12, 1928. Serial No. $15,214.

This invention relates to a mechanical movement, and its principalobjects are to provide a device which shall:

First, measure ofi mechanically predetermined motion intervals.

Second, be applicable to cause the functioning of other mechanism atpredetermined motion intervals. Y

Third, be simple', positive and reliable in its inaction.

Fourth, be comparatively inexpensive.

In many kinds of mechanism it frequent-ly becomes desirable to cause thefunctioning oit the mechanism or certain parts thereof, in certainmotion periods. For example, it might be required that an electric motorafter being started, should continue running until it has madesubstantially a predetermined number of revolutions, and then,` thatthere be a period of rest. In such a case, the present invention finds atypical application, and a simple form of my device comprises two ormore toothed wheels mounted for independent rotary motion side by sidealong a common axis of rotation.

Each of the wheels has a dierent number of teeth, varying from oneanother,Y prefer? ably by one or two teeth. These .toothed wheels orgears are in mesh in common with a single driver. The result is thatwhen the gear having the least number of teeth makes one completerevolution, then the other gears of the group will each fall short Vofmaking one complete revolution by an amount which is equal to thecircumferential distance occupied by the excess number of teeth andspaces of such gears over and above the number in the first gear.

Assuming an illustrative caseA where two gears are employed, the secondgear having one tooth more than the first gear, andthe two gears beingsimultaneously in mesh with a driving worm having a simple thread.Naturally, the lirst gear would have n teeth, and the second, n plus lteeth. Vhile the first gear makes one revolution, the second gear lacksone tooth and one space of making one full revolution. Therefore, it thetwo gears stand mutually in a given circumferential relation to eachother in the beginning, then at the end ot n revolutions of the worm,they will have moved circumferentially with respect to each other, adistance equal to one tooth and one space. it the end of 2n revolutionsof the worm, the two gearswill have moved past each other a distanceequal to two teeth and two spaces, and so on, until the number of'revolutions of the worm is equal to the number of teeth in the secondgear multiplied by the number of teeth in the iirst gear, at which timethe two gears shall again stand in exactly the same circumferentialrelation as in the beginning. By providing on the two wheels, port-ionswhich come into conjunction, and also providing a coacting memberengaging the said portions when these are in conjunction, it becomespossible to make the occurrence ot' such conjunction, the dominating-factor to cause certain other mechanical actions.

By varying the number of wheels,.the number of teeth in the wheels, thenumber ot portions which come into conjunction, and/or the number otthreads on the worin, er by using a gear in place of the worm, numeroususeful perioddetining combinations may be obtained.

The features ot this invention tor which the protection of LettersPatent is desired, are collectively grouped in the claims concludingthis specification.

ln the drawingrr,v which illustrates, somewhat in diagram, merely oneembodiment of this invention,

Fig. l represents a side elevation, parts broken away; j

Fig. 2. a section taken on line 2-2, Fig. l;

Fig. 3, a fragmentary portion oit Fig. 1 showing a part in an alternateposition;

Fig. e, a fragmentary exploded view in perspective; and

Fig. 5, a 'fragmentary plan viewed from line 5-5, Fig. l.

Referring to the drawing, the numeral lO indicates toothed ring or gearhavinor for instance, forty `Lseth, while l2 and 14 indicate othertoothed rings or gears having respectively 'torty-one and forty-twoteeth. These three gears are rotatably mounted side by slde on thecircular ange l5 projecting from 12 and 1i, is the single will be notedm Fig. 2,

i'orm virtually a composite worm wheel, ot'

which the component gears may be regarded as slices whose planes areperpendic.nar to the axis of rotation, each slice being movable againstthe next one.

There enters here a mechanical inconsistency, because it is obviouslynot possible to have a number of gears, e, ch with a diilierent numberof teethotace .mpitch,rotatiug aooutthe same axis and in the propertheoetical mesh with one and th same worm. s a matter et t'act, theactual pitch :',iametcr o each one ot the gears is dii'erent trom theothers, but this difference slight, and can practically be neglected so.tar as a satisfactory working ot the assemhl e is concerned, becausethe nuniber oft teeth in each gear is chosen large enough and the pitchot the teeth made small enough, so that the resulting dillerenccs in thepitch diameters of gears are immaterial.

lVhere a high degree or" mechanical perfection is not required, theindividual gear slices n'iay be cut in the usual manner and these beassembled to form the worm wheel. rl"he teeth of the worm wheel, wherethey mes- 1h with the worm, appear substantially as shown in Fig. Itgreater mechanical relinement is desired, each of the gear slices may bepreliminarily cnt with the respective required number ot eeth, and theslices be then placed together as required tor the worm gear, this beingcut by means o'f a hob much atter the usual manner, with adil'l'erential motion however, between the gear slices in the planesthereof, inasmuch as these are constrained to lfollow the thread orthreads ot' the hob.

In the con'ipossite worin wheel, its respective .sectional parts orslices will necessarily be rotated in a constantly changing angularrclationf-thip to one another when engaged ley the driving worm, owing`to the unequal munlzer oit teeth in the dili'erent sectional parts.

'l'he respective sectional worn'l wheel parts 10, 12 and 14 have deiincdtherein the notches 101, 121 and 141, which notches, in the stationiaryposition ot' the apparatus, are in conjunction, and form a seatengageable by a dog 20. This dog is slidable radially, and when theapparatus is not functioning, is held in the loci-:ed position by aspring 21, the spring being mounted on a stationary pi n The dog maycarry a contact men'iber, such as the arm 24, the purpose o t which willpresently become clear.

' he manner in which this device functions will now be described.supposing the worm 19 to be rotating so as to turn the composite wormwheel, whose component sections lie substantially in planes adjacent oneanother, in the direction of the arrow 31, and supposing the notches 10,12, 111, for the moment, to be in non-conjunctiv-e positions, asindicated in Fig. 1. New, as the motion continues, the said notcheswill. tinally be brought into conjunction at a definite circumferentialpoint, such as 36 in Fig. 1, just above the dog Q0.

Meanwhile, the tace Q01 of the dog will ride against the journal surfaceQG, due to the pressure exerted by the spring 21, but as soon as thestated conjunction ot the notches occurs, the dog will be forced intoits seat and is then carried forward by the rotating composite Wormwheel to the position shown in Fig. 3. A moment after reaching this lastposition, the arm E24 is acted upon by the kickout stop 27, which pushesthe dog inwardly as indicated by the arrow 32, thus releasing it fromengagen'ient with the composite worm wheel. From here the dog may bereturned by hand, or by other convenient means, to its normal positionready tor the next engagement with the composite worm wheel.

In its angular travel about the axis 941, the dog is accompanied by thedisk 1G, inasmuch as the dog is coniined by the guide portions of thedisk, and by its own guide portions 202, which latter are in slidablecontact with the hub sleeve 2S. This arrangement also provides thenecessary radial guidance for the dog.

The motion period of this device is determined by the movement ont thecomponent gear sections from one conjunction to the next and theactuating eli'ect ot the device may be utilized when the dog Q() ismoved by the composite gear trom one position to the other.

Motion from the disk 1G may be utilized for the periodic actuation ofother devices, such as electrical switches and ilor numerous purposeswhich will readily occur to a skilled designer. To transmit the motionfrom the disk to such other devices, any well known mechanical elementsmay he employed, such as the pin Ll() acting against an arm 41.

It should be noted that the notches 10, 1Q, 14, begin moving past oneanother, or staggering, as soon as they leave the conjunctivc positionindicated at 3G. lfheretore, when the gear sections are engaged by thedog, as the latter moves outwardly from its position in Fig. 1, it isnecessary that a certain leeway be provided to allow the teeth ot' thevarious gear sections to accommodate themselves to the threads ot theworm, while the dog is traveling from the position just mentioned, tothe kick-out position indicated in Fig. 3. This leewav may be obtainedby tra making the Width of the notches 101, 121, 141 enough greater thanthe Width of the dog, as indicated at 30, Fig. 3, that there Will be noconflict between any of the composite Worm Wheel teeth and the threadsof the Worm during the movement of the locked Worm Wheel sections fromthe position indicated in Fig. 1 to the position indicated in Fig. 3.

It Will be understood of course, that the notches 101, 121, 14:1, inmoving around the circumference of the flange 15, from one conjunctionto another, do so'in continually changing circumferential relationship,so that the dog 2O is compelled to remain in the position shown in Fig.1 until such a con- ]unction occurs, at which time the small radiallyoutward movement occurs, causing the dog to enter the conjunctionednotches. The engaged dog is moved away from its initial position (Fig.1), carrying With it the disk 16, and in turn, the pin 40 and arm 41.Any Well known mechanism (not shown) such as an electric switch andmotor, may be thereby influenced to cut oil' the rotative motion ot theworm.

The entire mechanism then remain's at rest until such a time as motionis again imparted to the Worm, Which causes the dog to be moved to thedisconnecting position, just beyond that indicated in Fig. 8, apreviously explained, the motion continuing to complete another cyclelasting until the arm 41 is again pushed over.

lVhile a specific embodiment of this invention is herein shown anddescribed, it is to be clearly understood that all the detailed partsthereof, may or may not be shown in the pre- `ier-red forms, andfurther, that the preferred Yforms may be varied 'from time to time asthe development of this invention and the arts to which it appertains,advance. Therefore, the essential. and characteristic ieatures of thisinvention will be readily discernible from the claims in wiich itsspirit is gencralized.

Having 'fully described. my invention, what I claim is: f

1. A mechanical movement comprising a plurality of gears, every gear Otsaid plurality having a number et teeth different from thenumber in anyof the other said gears, means deriving motion from said gears everytime said gears come into a predetemined recurring conjunction with oneano-ther, and a driver in common operative upon said gears.

2. A mechanical movement comprising a plurality of gears, every gear ofsaid. plurality having a number of teeth different from the number inanother gear of said plurality, a worm simultaneously in mesh with allsaid gears, and means deriving motion from said gears at recurringeonjunctions thereof.

3. A mechanical movement comprising a plurality of gears Vlyingsubstantially in planes of rotation adjacent one another and having anaxis of rotation in common, each of the said gears having a number ofteeth different from the number of teeth in the others of saidplurality, and a driver simultaneously in mesh with all the said gears.

l. A mechanical movement comprising a Worm wheel composed of a pluralityof slices delined by planes substantially parallel to the plane ofrotation, said slices having various pitch diameters and various numberso1 teeth of equal pitch, but the same axis of rotation, and a Wormsubstantially in mesh with said Worm Wheel. r

5.7A mechanical movement comprising a composite Worm Wheel having aplurality of toothed sections transverse to the axis thereof, thenumbers of teeth in the various sections and the pitch diameters thereofdiffering from one another While the pitch of all the teeth is the same,and a Worm substantially in mesh With said. Worm Wheel.

6. A mechanical movement comprising a plurality of gear sections definedsubstan-V tially by planes perpendicular to the axis of rotation, everyone of said gear sections having a number ot' teeth and pitch diameterdiiierent from the number of teeth and pitch diameter in any other ofsaid sections, the pitch being the same, and a driving Wormsimultaneously in mesh with all the gear sections ot the said plurality.

7. A mechanical movement comprising plurality of gears having a commonaxis and planes of rotation substantially parallel to one another, eachof the said gears having a number of teeth diiierent from the number ofteeth in the other gears, a driver simultaneously in mesh with all thegears ot the said plurality, engaging portions delined on the saidgears, said engaging portions coming into conjunction with one anotherintermittently, and an engaging member co-acting with said engagingportions Whenever said conjunction occurs.

8. A mechanical movement comprising a plurality of gear sections havinga common axis and defined by planes substantially perpendicular to theaxis ot rotation thereof, each of the said gear sections having a numberof teeth different from the number of teeth in the other sections but ofthe same pitch, engaging portions defined in the said gear sections, adog intermittently engaged by said engaging portions, a stop for saiddog, a kick-out operative upon said dog, and a driving Worm meshingsimultaneously with all the said gear sections.

9. In combination, a rotatable member, a plurality of gears rotatable onsaid rotatable member, said gears varying from one another in numbers ofteeth, a Worm substantially in mesh with all said gears simultaneously,means for causing engagement between said lill) gears and said rotatablemember when said gears are in a certain conjunction, and ineens forreleasing said engaging moans.

l0. In combination, a rotatable drinn, :L plurality of gears rotatableon said drinn, rial gears varying from one another in numbers of teeth,:i worin substantially in mesh with all said gears simultaneously,notched portions Within said gears, a spring-pressed clog within saiddrum, said dog positioned to be engaged by said notched portions when inconjunction, and means for releasing said clog.

ln tesciinony whereof7 I sign my naine 15 hereto.

JOSEPH C. CALL.

